DPF burn

[DaveB]

Recently when travelling back to Melbourne from Narooma we stopped in Bruthen, its a small country town used by many drivers as a rest stop. Was a 35 degree day, had just done a 4.5 hour stint and the Grenadier must have been part way through a burn. We had to stop as I needed a slash and a pie and a Big M, but the cooling fans ran at max velocity the entire time we were away from the car. The whole town was staring and glaring at the ruckus coming from the Grenadier, we skulked back from the bakery and quickly drove back down to a nearby deserted footy oval to park under a tree and finish our lunch in solitude.

You (and everyone around you) will know when its doing a burn, trust me.

I stopped outside the shops in Hervey Bay last week and waited in the Grenadier while my wife went in to pick a few things up.
I had windows down and safari windows open so I turned the car off and sat there and read a book.
It was doing a DPF burn so pretty noisy.
This lovely woman came over and demanded that I turn the vehicle off and stop destroying the planet with pollution.
I held up the keys and told her the engine was turned off.
She didn't believe me.

 

[Skydance]

I stopped outside the shops in Hervey Bay last week and waited in the Grenadier while my wife went in to pick a few things up.
I had windows down and safari windows open so I turned the car off and sat there and read a book.
It was doing a DPF burn so pretty noisy.
This lovely woman came over and demanded that I turn the vehicle off and stop destroying the planet with pollution.
I held up the keys and told her the engine was turned off.
She didn't believe me.

It’s in Rocket booster mode.

 

[Sam]

Presume if raised with Ineos they will just shrug and cite [insert name of euro emissions regulation].

Could not the car provide a warning/ info "DPF clean within X km/ Xmins", so I can manage my expectations, or plan for it?

 

[DaveB]

Presume if raised with Ineos they will just shrug and cite [insert name of euro emissions regulation].

Could not the car provide a warning/ info "DPF clean within X km/ Xmins", so I can manage my expectations, or plan for it?

That would be good.

 

[NQ94]

I stopped outside the shops in Hervey Bay last week and waited in the Grenadier while my wife went in to pick a few things up.
I had windows down and safari windows open so I turned the car off and sat there and read a book.
It was doing a DPF burn so pretty noisy.
This lovely woman came over and demanded that I turn the vehicle off and stop destroying the planet with pollution.
I held up the keys and told her the engine was turned off.
She didn't believe me.

The stupid thing about all these pollution control measures is that the vehicles would use considerably less fuel, be less aggressive on engine oils and have longer engine life without them. It seems to be a flawed concept burning more to create less.

 

[DaveB]

The stupid thing about all these pollution control measures is that the vehicles would use considerably less fuel, be less aggressive on engine oils and have longer engine life without them. It seems to be a flawed concept burning more to create less.

Pretty much sums up a lot of these "save the planet" solutions.
Wind farms were all the rage until cows started falling over and wildlife vanished.
Solar farms took over but nobody has mentioned what the cost will be financially and waste disposal when all the panels need replacing
Battery storage is now all the rage but again batteries are dirty to make and have a shelf life.
Now we are back to nuclear which we all know is safe.

 

[DenisM]

Presume if raised with Ineos they will just shrug and cite [insert name of euro emissions regulation].

Could not the car provide a warning/ info "DPF clean within X km/ Xmins", so I can manage my expectations, or plan for it?

I know I'm repeating myself.. however I've come to the conclusion that the "loud" fan activation is not necessarily a DPF burn, but rather a measure to reduce the effects of "heat sink" and protect the oil galleries supplying the twin turbos from developing deposits and other "gunk". ....

 

[bemax]

I stopped outside the shops in Hervey Bay last week and waited in the Grenadier while my wife went in to pick a few things up.
I had windows down and safari windows open so I turned the car off and sat there and read a book.
It was doing a DPF burn so pretty noisy.
This lovely woman came over and demanded that I turn the vehicle off and stop destroying the planet with pollution.
I held up the keys and told her the engine was turned off.
She didn't believe me.

If you wouldn’t own a Grenadier you probably wouldn’t have believed it yourself

 

[Clark Kent]

I know I'm repeating myself.. however I've come to the conclusion that the "loud" fan activation is not necessarily a DPF burn, but rather a measure to reduce the effects of "heat sink" and protect the oil galleries supplying the twin turbos from developing deposits and other "gunk". ....

Have you noticed during a burn if both fans are running? Current flow is around 100A so something is pulling a lot of power. I think the auxiliary fan might be the noisy one, unsure.

 

[NQ94]

Have you noticed during a burn if both fans are running? Current flow is around 100A so something is pulling a lot of power. I think the auxiliary fan might be the noisy one, unsure.

The main fan pulls around 80amps on its own.

 

[landmannnn]

Pretty much sums up a lot of these "save the planet" solutions.
Wind farms were all the rage until cows started falling over and wildlife vanished.
Solar farms took over but nobody has mentioned what the cost will be financially and waste disposal when all the panels need replacing
Battery storage is now all the rage but again batteries are dirty to make and have a shelf life.
Now we are back to nuclear which we all know is safe.

So true.
I've got a 1925 Citroen. With the right carburettor it will do 60mpg about 5l/100km. So the last 99 years of vehicle enhancements haven't given us quite what we expected.

 

[Skydance]

Anybody noticed that the DPF burn happens too often. I know it’s conditions based and not mileage. Lately I’ve been shorter journeys so the frequency of the burn has increased. God it’s loud, It’s midnight in a small village and people are opening their curtains and giving me the looks.

I’ve got an appointment with a man from Ineos. I will ask him, why did they design it to be this loud, surely it can’t be normal or good for the car or environment.

 

[Tazzieman]

So true.
I've got a 1925 Citroen. With the right carburettor it will do 60mpg about 5l/100km. So the last 99 years of vehicle enhancements haven't given us quite what we expected.

So pretty the Citroen much the performance of a donkey! They also have iffy brakes, and thanks to China are almost extinct

 

[Clark Kent]

Anybody noticed that the DPF burn happens too often. I know it’s conditions based and not mileage. Lately I’ve been shorter journeys so the frequency of the burn has increased. God it’s loud, It’s midnight in a small village and people are opening their curtains and giving me the looks.

I’ve got an appointment with a man from Ineos. I will ask him, why did they design it to be this loud, surely it can’t be normal or good for the car or environment.

DPF regeneration ('burn') is triggered by the soot loading exceeding a predetermined limit in the DPF. This is measured by differential pressure in the exhaust pipe before and after the DPF. Depending on the pressure readings, the ECU (called the DDE in BMW language) will activate the regeneration cycle.
The ECU also monitors the distance travelled and the driving mode since the last regeneration.
So depending on how you have been using your vehicle you might go a week, a month or months between regeneration. It all depends on the rate of soot accumulation. Short city trips at lower operating temperatures appear to generate more exhaust soot hence the recommendation to get out on the open road occasionally and allow your vehicle to operate at highway speed and temperature for 20 mins as a means to reduce the requirement for regeneration cycles.
I recommend a read of the BMW B57 training guide (it's been posted to the forum). DPF Regeneration starts on page 119.

I also note from the training guide that the engine is placed into a high temperature cycle to support regeneration. Air flow is reduced, fuel injection volume is increased and the injection timing is retarded - all to increase the exhaust gas temperature to around 500 degrees C. That high heat load is probably why we're seeing the cooling fans operating at high speed (and noise!). I had also noticed via the off-road page but never understood why until now, that the engine oil temperature increases about 10 degrees C during a burn. The engine is forced to run hot when a regeneration is occurring and the oil temp rises as a result.

 

[dreamalaska]

Outback travellers put on notice after increase in car fires

Thought snakes and crocodiles were the main hazard in the outback? Think again. Motoring experts say after the big wet season cars are catching alight due to vegetation growth.

www.abc.net.au

 

[landmannnn]

So pretty the Citroen much the performance of a donkey! They also have iffy brakes, and thanks to China are almost extinct

You are not wrong, although iffy brakes may be an understatement.

 

[Skydance]

DPF regeneration ('burn') is triggered by the soot loading exceeding a predetermined limit in the DPF. This is measured by differential pressure in the exhaust pipe before and after the DPF. Depending on the pressure readings, the ECU (called the DDE in BMW language) will activate the regeneration cycle.
The ECU also monitors the distance travelled and the driving mode since the last regeneration.
So depending on how you have been using your vehicle you might go a week, a month or months between regeneration. It all depends on the rate of soot accumulation. Short city trips at lower operating temperatures appear to generate more exhaust soot hence the recommendation to get out on the open road occasionally and allow your vehicle to operate at highway speed and temperature for 20 mins as a means to reduce the requirement for regeneration cycles.
I recommend a read of the BMW B57 training guide (it's been posted to the forum). DPF Regeneration starts on page 119.

I also note from the training guide that the engine is placed into a high temperature cycle to support regeneration. Air flow is reduced, fuel injection volume is increased and the injection timing is retarded - all to increase the exhaust gas temperature to around 500 degrees C. That high heat load is probably why we're seeing the cooling fans operating at high speed (and noise!). I had also noticed via the off-road page but never understood why until now, that the engine oil temperature increases about 10 degrees C during a burn. The engine is forced to run hot when a regeneration is occurring and the oil temp rises as a result.

Thanks for the explanation.